A Multigrid-FFT Algorithm for Analyzing Scattering from Electrically Large Structures

A new Multigrid-FFT (MGFFT) algorithm, combined multigrid method with FFT, is presented in this paper for analyzing scattering from electrically large structures. Used as an efficient iterative algorithm, multigrid method (MG) is different from other multilevel MoM in nature. In the MG procedure, the FFT is applied for the calculation of the convolutional integrals involved. The numerical results shown that the MGFFT method is an efficient approach for the analysis of electrically ladle size problems.